It will come down to how much debt the combined structure would have to end up being saddled with to pay for US buying AA, and the mess with multiple unions as well. Parkers other option would be to merge with, but keeping the companies separate until AA is out of BR and offering stock in the new company to the creditors. Adding true East Coast hubbing from US is the only thing that seems to bring a lot to the table to AA, something they can get without a merger. I'm not sure how the fleet/engine mix works, I'll let someone else decide whether that is a + or -. The real question is whether a combine AA+US scenario is the best competitive solution for AA or not. If AA can exit BR and recapitalize with an IPO without US and quickly implement its business plan, I think that puts US at a competitive disadvantage, meaning between UAL/DAL/AA/WIN/LCC, one of these carriers defaults for good within 3-4 years and without a merger, US would be most at risk..
AA would exit BR with much lower leasing costs and adjusted lease end dates, new fleets and cheap financing already lined up for the first couple of years when the Being orders start arriving, not to mention tying up a lot of manufacturing assembly lines at Being and Airbus. AA's unit costs will be the lowest of the five airlines above. The joint ventures will be in full swing with JAL now fully out of BR and running a lean operation. That sounds pretty good to me.
So then is AA better off independent, or just what else will US bring to the table.